Heat Exchanger Design for Gases: Air from 10-110 oC & Flue Gas 1259-725 oC

In summary, Paul is designing a heat exchanger to heat air from 10 oC to 110oC and cool flue gas from 1259.4 oC to 725 oC. He is wondering if a shell and tube heat exchanger would be suitable for gases. He is also looking for suggestions on a suitable heat exchanger type, considering factors such as heat transfer area, working pressure, pressure drop, fouling factors, and mass flow rate. Based on the given information, Plate type or Transverse High-Finned Exchangers are recommended.
  • #1
djdemzy
1
0
Good Evening,

I am currently desiging a heat exchanger to heat Air from 10 oC to 110oC and cool flue gas from 1259.4 oC to 725 oC.

As both fluids are gases, i would like to know if it is advicable to use a shell and tube heat exchanger?

Could you suggest a heat exchanger type please ?


Thank You Very Much
Kind Regards


Paul
 
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  • #2
Paul,

There are many other influencing factors in a heat exchanger design including the temperature. Namely Heat transfer Area, Working Pressure, pressure Drop, Fouling Factors and Mass Flow rate etc. You need to consider these also. Because they'll might become a constraint in the manufacturing phase. But as per your provided information Plate type or Transverse High-Finned Exchangers are suitable.
 

1. What is the purpose of a heat exchanger?

A heat exchanger is a device used to transfer heat from one fluid or gas to another, without them mixing together. In the case of the design for gases mentioned, the heat exchanger is used to transfer heat from hot flue gas to cooler air, in order to increase the temperature of the air.

2. How does a heat exchanger work?

A heat exchanger works by having two separate channels, one for the hot gas and one for the cooler gas. These channels are typically separated by a metal wall, which allows the heat to transfer from one channel to the other. The hot gas heats up the metal wall, and the cooler gas is then heated by the metal wall as it passes through the channel.

3. What factors should be considered when designing a heat exchanger for gases?

When designing a heat exchanger for gases, there are several factors that need to be taken into consideration. These include the flow rates and temperatures of both gases, the materials used for the heat exchanger, the surface area available for heat transfer, and the efficiency of the heat exchanger.

4. How is the efficiency of a heat exchanger determined?

The efficiency of a heat exchanger is determined by the amount of heat that is transferred from the hot gas to the cooler gas. This is typically measured by the effectiveness of the heat exchanger, which is the ratio of the actual heat transfer to the maximum possible heat transfer. Factors such as flow rates, temperatures, and materials used can all affect the efficiency of a heat exchanger.

5. How can the design of a heat exchanger for gases be optimized?

The design of a heat exchanger for gases can be optimized by considering the factors mentioned previously, as well as the specific needs and constraints of the application. This may involve adjusting the flow rates and temperatures, using materials with high thermal conductivity, and maximizing the surface area available for heat transfer. Computer simulations and experimentation can also be used to fine-tune the design and improve its efficiency.

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